Reviving an XU4 after a short circuit between 5V and GND

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adeuring
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Reviving an XU4 after a short circuit between 5V and GND

Post by adeuring »

I am probably not the first one who managed to short circuit the 5V and GND pins of the shifter shield or expansion connectors, so here is a short guide what one could try to revive the board. This requires at least a bit of experience with soldering SMT elements – if you've never used a soldering iron before, ask a friend for help or try to get at least a bit of practice. My work isn't strictly professional either, as can be seen in the second image below.

The most likely consequence of this short circuit is that the chips U5 and U6 are blown up (see page 2 of the schematics: https://dn.odroid.com/5422/ODROID-XU4/S ... 151202.pdf ).

The image below shows the two chips on the right side. Notice the two "pockmarks" near the upper edge of U5. It seems that the chip got really hot.
before.jpg
before.jpg (302.68 KiB) Viewed 1994 times
(The left side of the image show the ethernet connector and the SD card slot.)

These chips aren't strictly necessary to run the XU4 – they are intended as an overvoltage protection. And they also seem to act as a modern silicon variant of a traditional fuse ;) But it is possible to simply short-circuit them:

Firstly, remove the heat sink.

Secondly, solder a wire from the 5V side of C37 to the 5V side of C38. These are the bypass capacitors of U6, and it's easier to solder a wire them than to pins 1, 2 and 11, 12 of U5 or U6:
after.jpg
after.jpg (236.82 KiB) Viewed 1994 times
Thirdly, remove the old thermal grease from the SOC and the heat sink (I'm using isopropyl for this), apply new thermal grease and attach the heat sink to the board.

Ready :)
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rc1997258 (Wed Aug 19, 2020 2:52 am)

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by Schnitzelbrain »

Nice, although I hope that I will never need it.

Gesendet von meinem SM-G930F mit Tapatalk
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rc1997258 (Wed Aug 19, 2020 2:52 am)

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by mad_ady »

I take it you couldn't power it through the gpio pins and now you're powering through the barrel connector?

It's a great repair/bypass!

@odroid: you should create a subcategory on the wiki with troubleshooting a dead XU4 with links to this :)

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by adeuring »

mad_ady wrote:I take it you couldn't power it through the gpio pins and now you're powering through the barrel connector?
Sure, I could connect the right GPIO pins to the power supply – but I had already the cabling for the barrel connector, so the question was: Should I change that cabling or should I try to mess with the board itself? I simply opted for the latter.
It's a great repair/bypass!
thanks :)
@odroid: you should create a subcategory on the wiki with troubleshooting a dead XU4 with links to this :)
Agreed, such a page would be quite useful. But it is probably easier for many users to use the GPIO connector to feed power to the XU4 than to try my fix, so the fix "power supply via expansion connector" should IMHO have more emphasis on such a page.
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rc1997258 (Wed Aug 19, 2020 2:52 am)

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by Luke.go »

Hi there.
We made wiki! based on your guide! :D
https://wiki.odroid.com/odroid-xu4/trou ... _ic_ncp372

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by algirdasc »

Hello,

Sadly, I didn't manage to start playing properly with my ODROID when it fried. Long story short - I powered my XU4 on ATX PSU 5V, but I might reversed polarities of 5V (I will check it with multimeter later), but currently stinky smell of burned chip is in my nostrils. After removing heatsink I saw only one NCP372 chip, which, I assume, must have been protecting from reversed polarity or overvoltage situation? Tomorrow I'll buy proper 5V/4A power supply, but meanwhile, how can I bypass NCP372 chip?
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Re: Reviving an XU4 after a short circuit between 5V and GND

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by rooted »

Interesting, the images are different? The XU4 in the wiki has two.

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by mad_ady »

Either it's a different revision, or it burned beyond recognition :D

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by algirdasc »

Revision is 0.1 20170905. But I looked at WIKI, looked at ODROID schematics and managed to bypass overvoltage chip. I tested my ATX wires, and looks the fault is mine - I reversed polarities. Also, after checking with multimeter, it measured 5.25V. Is this too much for ODROID?

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by rooted »

algirdasc wrote:Revision is 0.1 20170905. But I looked at WIKI, looked at ODROID schematics and managed to bypass overvoltage chip. I tested my ATX wires, and looks the fault is mine - I reversed polarities. Also, after checking with multimeter, it measured 5.25V. Is this too much for ODROID?
5.25v is fine.

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Re: Reviving an XU4 after a short circuit between 5V and GND

Post by odroid »

algirdasc wrote:Hello,
After removing heatsink I saw only one NCP372 chip, which, I assume, must have been protecting from reversed polarity or overvoltage situation? Tomorrow I'll buy proper 5V/4A power supply, but meanwhile, how can I bypass NCP372 chip?
Two NCP372 chips were replaced with one TPS259251 from '2017 October.
Please refer page 2 on the latest schematics.
https://dn.odroid.com/5422/ODROID-XU4/S ... 170905.pdf

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